MediaWikiWidgets.org is a community project to maintain a collection of widgets for MediaWiki Widgets extension.
MediaWiki Widgets extension allows adding widgets to wiki by just creating pages in Widget namespace.
As promised, the team at Netvibes, the very popular customizable homepage, has released the developer preview of their Universal Widget API (UWA). Widgets developed using this API work not only on Netvibes but many other widget platforms and blog systems: Google IG, Apple Dashboard, and so on.
Vidyo's VidyoConferencing 3.0 is a major release including a new desktop conferencing system, a sharing and collaboration system, and two new room system form factors. One of the most interesting features is Vidyoweb that works in browsers to include users of IM clients such as Skype and Google and streamlined experience for guest users on the system.